Forty-seven Ronin Remembrance Day in Sengaku-ji, Tokyo
Forty-seven Ronin Remembrance Day in Sengaku-ji, Tokyo is held on December 14. This event in the second decade of the month December is annual. 
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The story tells of a group of samurai who were left leaderless after their daimyō (feudal lord) Asano Naganori was compelled to perform seppuku (ritual suicide) for assaulting a powerful court official named Kira Yoshinaka. After waiting and planning for a year, the rōnin avenged their master's honor by killing Kira.
The revenge of the forty-seven rōnin also known as the Akō incident or Akō vendetta, is a historical 18th-century event in Japan in which a band of rōnin (lordless samurai) avenged the death of their master. The incident has since become legendary. It is one of the three major adauchi vendetta incidents in Japan, alongside the Revenge of the Soga Brothers and the Igagoe vendetta.
To this day, the story remains popular in Japan, and each year on 14 December, Sengakuji Temple, where Asano Naganori and the rōnin are buried, holds a festival commemorating the event.
Similar holidays and events, festivals and interesting facts
Japan Kanji Day on December 12 (Kanji are Chinese characters used in modern Japanese writing along with hiragana, katakana, Arabic numerals, and romaji. On this day, the kanji of the year is chosen and announced at a special ceremony. It is selected by the Japan Kanji Professionals Society through the national ballot);
Commemoration Day of 47 rōnin in Japan on December 14
World Otaku Day on December 15 (a person who is passionate about something);
Cinderella Day in Japan on December 31 (Shinderera De);
Gandzicu in Japan on January 1
Hatsuyume in Japan on January 2
Tamaseseri Festival on January 3 (Hakozaki Shrine, Fukuoka, Japan)